well worth the money
I spent a week in Beijing and this app made it much easier to get around. ~95% of the landmarks, restaurants, and other destinations were programmed in and every taxi driver understood where we wanted to go. I did not want to turn a cell phone on and this phone made it so I never had to call my hotel concierge or enable the data roaming on my iphone. I probably saved the cost of the app right there.
FWIW: Some places have little reviews in them and I found them to be mostly correct.
aonetwothree about
Beijing Taxi Guide and Offline Maps